Install wkhtmltopdf on CI

.circleci/config.yml

@@ -13,6 +13,7 @@ jobs:
             - run: which rustfmt || cargo install rustfmt
             - run: apt update && apt install -y wget
             - run: make lib
+            - run: ./.circleci/wkhtmltopdf.sh
             - run: cargo fmt -- --write-mode=diff
             - run: make build
             - run: make release

.circleci/wkhtmltopdf.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# 'stolen' from https://github.com/JazzCore/python-pdfkit/blob/master/travis/before-script.sh
+
+set -e
+
+apt-get install -y openssl build-essential xorg libssl-dev
+wget https://downloads.wkhtmltopdf.org/0.12/0.12.4/wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
+tar -xJf wkhtmltox-0.12.4_linux-generic-amd64.tar.xz
+cd wkhtmltox
+chown root:root bin/wkhtmltopdf
+cp -r * /usr/